I have tried the treats, squeaky toys, long leads, pretending to find something, they all work with varying degrees of failure, they only work when she doesnt have a quarry. When she gets her head down there is only 2 ways to stop her,
1 follow her and let her get to whats she is after.
2 let her work and hope you can get a grip of her,
just hope they calm down as they get older